$1!04!U<!FM!7o!O(!:`!@,!WF!<e!^B (B/s - $1!7o'2>!;1!aMKN7!ON!^zs ($1!T+!4I!<D (B:s $1!7o'2>!;1!aMKN7!ON!^zs, 1984)
Keywords: $1!O(!:`!@,!WF(B.s; $1!<e!^B(B.s